Forget-me-not

Observation - Forget-me-not - UK and Ireland. Description: Likely to be an introduction or garden escape but is it a Myosotis arvensis variety or Myosotis sylvatica? And if you can tell them apart, how? I think flowers around 5-7mm across.

Likely to be an introduction or garden escape but is it a Myosotis arvensis variety or Myosotis sylvatica? And if you can tell them apart, how? I think flowers around 5-7mm across.